Contact device for movable electrical apparatus



Oct. 27, 1931. A. ARCHANGELSKY ET AL CON TACT DEVICE FOR MOVABLEELECTRIC APPARATUS Filed June 4, 1928 //7 yen for.

Patented Oct. 27, 1931 PATENT OFFICE ALEXANDER ARCHANGELSKY AND RUDOLFGOLDBERG, OF BERLIN, GERMANY CONTACT DEVICE FOR MOVABLE ELECTRICALAPPARATUS Application filed June 4, 1928, Serial No. 282,807, and inGermany December 4, 1926.

The invention relates to movable electric apparatus fed with electriccurrent by cables, which at once may serve for supporting the apparatus,such as for instance boring machines of dentists or in work shops,telephones, radio head phones, lamps and many other devices.

The essential feature consists therein, that in the current feedingcable one of the electric conductors is not isolated over a certainlength and adapted to come in contact with a roller or similar contactpart connected to the current source, whereas the other conductor orconductors may be directly connected to the current source. In this waythe pulling near or ulling down of the apparatus to the wor in placecauses the current automatically to be introduced and to flow as long asthe apparatus is not pushed away, so that without handling any specialcontact the apparatus works when in working position and is streamlesswhen in resting position. Thereby great reliability is attained, andmany inconveniencies resulting from forgetting a switch is avoided.

The invention further concerns several details which will appear fromthe following description.

In the drawing the invention is illustrated by a mikrotelephonesuspended on its current feeding cable.

A supporting roller 1, arranged on an overhead art of a room consists ofinsulating material and has a metal rim 1'. A current brush 2, connectedto one pole of a current source, which in this case is the telephoneline. To the second pole of the current source an insulated cableconductor 3 is immediately attached, which runs over a. loose roller 4weighted by a weight 5 (or a spring) and over the first roller 1, 1leads to the apparatus to be connected, which is shown as amikrotelephone 6 consisting of a mikrophone and a telephone. A secondnot insulated flexible conductor 7 is fastened to an insulating piece 7and this is fastened as well as the first conductor 3 to a ceiling 8 orother fastening point. The said second conductor 7 runs equally as thefirst conductor over the rollers 1, 1 and 4 to the mikrotelephone 6. Ithas an insulated part 7 running over the contact roller 1, 1, and in thelast part 9 both conductors 3 and 7 are twisted in usual man ner. A stop10 serves as abutment for the re turn movement of the cable caused bythe weight 5.

In the shown resting position no current flows, as the conductor 7 restson the contact roller 1, 1 with its insulated part 7". If themikrotelephone 6 is pulled down or aside, so that the not insulatedcable 7 contacts the roller 1, 1, the current circuit is closed and theapparatus is in working positions.

Calling and line selecting conductors may be united in usual manner withthe conductor 3, so that the mikrotelephone 6 can be of ordinaryconstruction. A line selector can also be incorporated in themikrotelephone, whereas the other accessories are assembled in usualmanner in a casing fastened to a room wall and connected to the cable 3and the current brush 2.

In case of using the device for boring machines and similar devicesdriven by strong currents the brush 2 is connected to the zero or groundconductor, and the cable conductor or conductors 3 to the other lineconductor or conductors of the constant or alternating or triphasecurrent circuit.

We claim:

A contact device for movable electric apparatus, comprising incombination a current conductor insulated throughout and being inconductive relation by its ends to one side of an electric source ofenergy and to one pole of the movable apparatus respectively, a secondcurrent conductor uninsulated throughout a part of its length but havinga part thereof covered with insulation and being secured at one end to asupport and at the other end to the other pole of the movable apparatus,a stationary roller having a conducting circumference supporting saidsecond conductor andbeing connected conducti'vely to the other side ofthe source of energy, a Weight applied to said second conductor fordrawing its insulated portion onto said roller, and a stop on saidsecond conductor for holding it in this position, so that a pull on theapparatus will move the last named insulated portion off said roller andcomplete a circuit by bringing the uninsulated portion of the secondconductor onto said roller.

In witness whereof We aflix our signatures.

ALEXANDER ARCHANGELSKY.

RUDOLF GOLDBERG.

